Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b75c3d708007911…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 13:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6811c2ff2b55449c6b1b6cc898463dfc SHA-1: a2bb3f8207fa94f5a1fe8b6ebd86711c9adaeab2 SHA-256: 6b75c3d7080079115b4397ae718408ab12dc5febac357c80bf4c333f5d7ddb1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. Several of these links point to compromised WordPress installations, suggesting a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=tabla+de+conversion+de+unidades+quimicas+pdf PDF link annotation
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3df08cab---80638565354.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/sutifo.pdfIn PDF document text
    • http://protok.pro/upload/files/78607850796.pdfIn PDF document text
    • http://malifer.hu/upload/file/23093386131.pdfIn PDF document text
    • https://unitjaya.com/contents/files/89603964503.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/nunipizufipesuvuxudatuji.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/69427155858.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608236603a71b---46894535437.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda44f2bc5---13959341809.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/damebifezedomekaz.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/numivomefuweduj.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/nepezufuxili.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af94ce16bee---rusugoxisumerajubabatidi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0613df6c6bfc9c8307b6d64a8982b1fb/53749194568.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/88238176358.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf2878c65---57209192646.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/20615820333.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/89034983339.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/78001287416.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/sozokiwuzitetawukefada.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c3fe439d422e8af7102624c8848e2704/binenafosedewe.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/lipobobonagu.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/61804142780.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gg8ji7al8uh9chkg9vig0r9j2g/gotenalu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6dd8194637---16484001158.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/rurefiluvutokamuvaluno.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 17044 bytes
SHA-256: 50840f90fbabfecaf0349316b6a5bbd6ae1014c533b561a9551314ce7520f25c
font_02_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 11100 bytes
SHA-256: c6132504faee68255f7d3e24fe7e1ae9cfc2c698abfe0768db14dc261a835c3c

Open this report in the interactive analyzer, or submit your own file for analysis.